Author: Dr Val Phua
Estimated reading time: 10–12 minutes
Children May Not Realise That Their Vision Is Blurred
Good vision plays an important role in a child’s learning, reading, coordination and overall development.
However, children do not always recognise that they have a vision problem. A child who has never experienced clear distance vision may assume that everyone sees the same way. Younger children may also be unable to describe blur, double vision or difficulty using both eyes together.
Instead, they may adapt by:
- Sitting close to the television
- Moving nearer to the classroom board
- Holding books or devices close to their face
- Closing or covering one eye
- Avoiding reading
- Losing concentration during visually demanding tasks
Regular vision screening and appropriate comprehensive eye examinations help identify problems before they interfere with learning or cause permanent visual consequences.
Why Are Children’s Eye Examinations Important?
A child’s visual system continues developing during the early years of life.
If one eye does not receive a clear image—or if the eyes are not working together properly—the brain may begin favouring the stronger eye. This can result in amblyopia, commonly known as “lazy eye”.
Amblyopia is usually easier to treat when detected early. Delayed diagnosis may lead to permanent reduction in vision, even when the eye itself appears structurally normal.
An eye examination may also detect:
- Myopia or short-sightedness
- Hyperopia or long-sightedness
- Astigmatism
- Squint or strabismus
- Amblyopia
- Congenital cataracts
- Eyelid abnormalities
- Retinal or optic-nerve disease
- Inherited eye conditions
- Less common but potentially serious childhood eye diseases
Vision Screening Versus a Comprehensive Eye Examination
These terms are sometimes used interchangeably, but they are not the same.
Vision Screening
Vision screening is a brief assessment designed to identify children who may have a vision problem.
It may be conducted:
- At preschool
- At school
- During a routine child-health assessment
- Using an eye chart
- Using an automated photoscreening device in younger children
Screening is valuable because it allows large numbers of children to be assessed efficiently.
However, it is not a complete examination of the eyes. A child who fails screening—or has symptoms despite passing—should undergo a comprehensive eye examination.
Comprehensive Eye Examination
A comprehensive examination is performed by an eye-care professional and evaluates both vision and eye health in greater detail.
Depending on the child’s age and concerns, it may assess:
- Vision in each eye separately
- Spectacle prescription
- Eye alignment
- Eye movements
- Focusing ability
- Binocular vision
- Colour vision where appropriate
- Pupil responses
- The front and back of the eyes
- Axial eye length in children with myopia
Eye Screening for Children in Singapore
In Singapore, the Health Promotion Board conducts vision screening through preschool and school-health programmes.
School screening is particularly helpful for detecting myopia, which is common among Singaporean children.
However, school screening is not intended to diagnose every possible childhood eye condition. It may not fully assess:
- Eye alignment
- Amblyopia in all situations
- Binocular-vision problems
- Focusing difficulties
- Retinal or optic-nerve disease
- The progression of established myopia
- Whether myopia-control treatment is working
Parents should therefore arrange a comprehensive examination if their child has symptoms, fails screening, has a strong family history or is already receiving treatment for an eye condition.
When Should a Child Have an Eye Examination?
The ideal timing depends on the child’s age, symptoms and risk factors.
Babies and Infants
A baby’s eyes are assessed as part of routine newborn and paediatric care.
An urgent specialist assessment may be required if there is:
- A white or abnormal pupil reflex
- A cloudy cornea
- An unusually large eye
- A constantly turned eye
- Drooping of an eyelid
- Persistent tearing or light sensitivity
- Poor visual attention
- Rapid, uncontrolled eye movements
- A family history of serious congenital eye disease
Premature babies at risk of retinopathy of prematurity follow a separate specialist screening programme.
Toddlers and Preschool Children
Vision should be assessed during the preschool years, ideally before formal schooling begins.
This is an important period for detecting:
- Amblyopia
- Squint
- Unequal prescriptions between the eyes
- Significant long-sightedness
- Astigmatism
- Early myopia
Children who cannot reliably complete an eye-chart test may be assessed using age-appropriate symbols, matching tasks, retinoscopy or photoscreening.
School-Aged Children
School-aged children should participate in regular vision screening.
A comprehensive examination is recommended if:
- The child fails screening
- There are symptoms or concerns
- The child wears glasses or contact lenses
- Myopia is progressing
- There is a previous eye condition
- The child is undergoing myopia-control treatment
Children with no symptoms who repeatedly pass age-appropriate screening do not necessarily require a comprehensive specialist examination every year.
Which Children Need Earlier or More Frequent Examinations?
Closer monitoring may be appropriate for children with:
- Myopia
- Rapidly changing prescriptions
- High myopia
- Amblyopia
- Squint
- Significant astigmatism or long-sightedness
- Previous eye surgery
- Premature birth
- Developmental delay
- Neurological conditions
- Diabetes
- Juvenile arthritis
- Long-term steroid use
- A family history of childhood cataracts, glaucoma, retinal disease or genetic eye disease
Children receiving atropine, Orthokeratology, defocus spectacle lenses or specialised myopia-control contact lenses also require regular follow-up.
What Happens During a Children’s Eye Examination?
The examination is adapted to the child’s age and ability to cooperate.
Young children do not need to know letters or speak fluently to have their eyes examined.
Medical and Visual History
The eye-care professional may ask about:
- Pregnancy and birth history
- Prematurity
- Developmental milestones
- Family history of eye disease
- Previous eye problems
- Spectacle use
- School performance
- Headaches or eye strain
- Screen and near-work habits
- Outdoor activity
- Current medications
Parents should bring previous spectacle prescriptions, medical reports and any school-screening results where available.
Visual Acuity
Vision is measured in each eye separately.
Depending on age, the child may be asked to identify:
- Letters
- Numbers
- Pictures
- Shapes
- Matching symbols
Testing the eyes separately is important because a child may see well with both eyes open while having poor vision in one eye.
Refraction
Refraction measures whether the child has:
- Myopia
- Hyperopia
- Astigmatism
- Unequal prescriptions between the eyes
Younger children can compensate for long-sightedness by using their strong focusing ability. This can make an undilated prescription appear less accurate.
For this reason, cycloplegic eye drops may be used to relax the focusing muscles and obtain a more reliable measurement.
Eye Alignment and Movement
The examiner checks whether the eyes:
- Point in the same direction
- Move together normally
- Maintain alignment at distance and near
- Work effectively as a pair
Tests may include a cover test, eye-movement assessment and evaluation of binocular vision.
Pupil and Red-Reflex Assessment
The pupil reactions and red reflex provide useful information about the visual pathway and the clarity of the eye’s internal structures.
An abnormal or unequal red reflex may require further investigation.
Examination of the Front of the Eye
A microscope may be used to examine:
- Eyelids
- Conjunctiva
- Cornea
- Anterior chamber
- Iris
- Natural lens
This helps detect allergies, infections, corneal abnormalities and childhood cataracts.
Dilated Retinal Examination
Dilating drops enlarge the pupils so that the retina, macula and optic nerve can be examined more thoroughly.
Dilation may be recommended when:
- The first comprehensive examination is performed
- The child has high myopia
- Vision cannot be fully explained by the prescription
- There are flashes, floaters or other retinal symptoms
- An optic-nerve or retinal condition is suspected
- There is a relevant medical or family history
Axial-Length Measurement
In children with myopia, axial length may be measured to monitor how quickly the eye is growing.
This can be particularly useful when assessing the effectiveness of myopia-control treatment.
Why Are Dilating Eye Drops Sometimes Needed?
Children have powerful focusing muscles. Without cycloplegic drops, they may inadvertently focus during testing, affecting the measured prescription.
Cycloplegic and dilating drops temporarily:
- Relax the focusing muscles
- Enlarge the pupils
- Improve the accuracy of refraction
- Allow a clearer examination of the retina
After dilation, the child may experience:
- Blurred near vision
- Increased sensitivity to bright light
- Enlarged pupils
These effects are temporary but may last for several hours and occasionally longer, depending on the drops used.
Sunglasses or a hat may improve comfort after the appointment.
How Should Parents Prepare Their Child?
A calm, positive explanation can make the visit easier.
Parents can tell the child:
- The doctor will ask them to look at pictures or letters.
- Different lights may be used to examine the eyes.
- They may need eye drops.
- Nothing sharp will touch the eye.
- There are no right or wrong answers—trying their best is enough.
It is also helpful to:
- Arrange the appointment when the child is usually alert.
- Bring their current glasses.
- Bring a favourite toy for younger children.
- Allow sufficient time if dilation may be needed.
- Avoid promising that no eye drops will be used.
Signs That Your Child May Need an Eye Examination
Arrange an assessment if your child:
- Squints to see distant objects
- Sits close to the television
- Holds books or devices unusually close
- Frequently rubs their eyes
- Covers or closes one eye
- Tilts or turns their head when looking
- Has an eye that turns in or out
- Complains of headaches after reading
- Experiences double vision
- Avoids reading or close work
- Loses their place while reading
- Has declining school performance
- Develops frequent changes in spectacle prescription
These behaviours do not always indicate an eye disease, but they should not be ignored.
Warning Signs Requiring Prompt Assessment
Seek prompt ophthalmic assessment if your child develops:
- Sudden loss or reduction of vision
- Eye pain
- Significant redness with light sensitivity
- A white pupil
- New flashes or floaters
- A curtain or shadow in the vision
- Sudden double vision
- A new constant squint
- Eye injury
- Chemical exposure
- A painful or red eye while wearing contact lenses
A white pupil seen in photographs should not be dismissed as a camera effect without appropriate assessment, particularly if it repeatedly appears in the same eye.
What If My Child Is Frightened or Uncooperative?
Paediatric eye examinations are designed to be flexible.
The clinician can often obtain useful information by:
- Observing how the child looks at toys
- Testing one eye while the child watches a video
- Using matching symbols rather than letters
- Assessing the red reflex
- Using retinoscopy to estimate the prescription
- Using photoscreening in selected children
Not every test needs to be completed at the first visit. The most important assessments are prioritised based on the child’s needs.
Frequently Asked Questions
My child passed school screening. Is another examination necessary?
Not always.
A child who has no symptoms and repeatedly passes appropriate screening may not require an annual comprehensive examination.
However, an examination is recommended if there are symptoms, family concerns, rapidly changing vision or a known eye condition.
Can very young children have their eyes tested?
Yes.
Children do not need to read letters or speak before their eyes can be assessed. Age-appropriate methods allow vision, alignment, prescription and eye health to be evaluated.
Will dilating drops hurt?
The drops may sting briefly. Blurred near vision and light sensitivity may occur afterwards, but the effects are temporary.
How long will the examination take?
A straightforward examination may be relatively quick, but appointments involving young children, additional testing or dilation may take considerably longer. Parents should avoid scheduling tightly timed activities immediately afterwards.
Does my child need glasses if the prescription is small?
Not necessarily.
The decision depends on the child’s age, type of refractive error, difference between the eyes, eye alignment, symptoms and risk of amblyopia.
How often should a child who wears glasses be reviewed?
Most children wearing glasses should be reviewed every six to twelve months. Children with rapidly progressing myopia or active treatment may require more frequent visits.
The Bottom Line
Children’s eye examinations involve much more than asking a child to read an eye chart.
A comprehensive assessment evaluates how clearly each eye sees, whether the eyes work together, whether a spectacle prescription is required and whether the eyes are healthy.
Singapore’s preschool and school vision-screening programmes provide an important first layer of detection, particularly for myopia. However, screening does not replace a comprehensive examination when a child has symptoms, fails screening or has an established eye condition.
Early detection can prevent avoidable visual impairment, support learning and provide the best opportunity for normal visual development.
References
- Health Promotion Board, Singapore. Health Screening for Primary School: Vision Screening.
- HealthHub Singapore. Common Eye Conditions in Your Preschooler.
- American Academy of Ophthalmology. Vision Screening for Infants and Children.
- American Association for Pediatric Ophthalmology and Strabismus. Vision Screening Recommendations.
- American Academy of Ophthalmology. Pediatric Eye Evaluations Preferred Practice Pattern.
- American Association for Pediatric Ophthalmology and Strabismus. Refractive Errors in Children.
- Singapore National Eye Centre. Paediatric Ophthalmology and Childhood Eye Conditions.
